Improvement in machines for shaking bolts and rivets



H. R. UNDEBIHLLI Machines for Making Bolts and Rivets.

Patented Dec. 8,1874.

96 nun/MM.

UNITED S'rA'rns I FFIGE.

HAZEN R. UNDERHILL, OF DERBY, NEW HAMPSHIRE.

IMPROVEMENT IN MACHINES FOR MAKING BOLTS AND RIVETS.

Specification forming part of Letters Patent No. 157,44, dated December 8, 1874'; application filed December 11, 1873.

To all whom it may concern: higher velocity to one of the rolls (say, b) than Be it known that I, HAZEN It. UNDER- HILL, of Derry, in the county of Rockingham and State of New Hampshire, have invented an Improvement in Rolling Metal; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is

. a description of my invention sufficient to enable those skilled in the art to practice it.

The invention relates to an improved means for reducing metal to a round shape, either spherical, cylindrical, or irregular.

In my invention I employ two rolls, rotating in the same direction, and placed at such distance apart as will cause the space between them, in the plane of their axes, to correspond to the shape in section which the reduced bar is to have. The rolls are so geared together that the surface of the roll, the motion of whose inner surface is downward, shall move a little faster than the surface of the roll, the motion of the inner surface of which is upward. I The blank or bloom is dropped upon and between the rolls, and at once begins to rotate in the direction of the speeded roll, and by the respective action of the two rolls upon the blank they are prevented from biting upon it, while at the same time the metal, in consequence of the surface of one roll moving faster than that of the other, is gradually carried down between the rolls, and so reduced in size and shape as to permit it to pass through the rolls.

The drawing represents a machine embodying my invention.

Figure 1 shows a sectional elevation of the machine. Fig. 2 is a plan of the machine.

a 1) denote the two parallel rolls, having shafts or gudgeons journaled in suitable boxes or housings. The shafts of these two rolls carry gears 0 d driven (by intermediate gears e e) from a gear, 00, on a driving-shaft, f, the rolls being thereby rotated in the same direction, their adjacent faces, of course, moving in opposite directions. The gear 6 is made of slightly lesser diameter than the gear 6, and the gear d with a slightly greater diameter than the gear 0, so as to insure a somewhat to the other, a.

The blank to be reduced to form is dropped upon the rolls, in the vertical plane between them, and, lodging upon them, the action of the rolling surfaces, one in a downward direction and the other in an upward direction upon it, soon reduces the blank to a round form, of a diameter corresponding to the distance between the rolls at their nearest point, the action of one roll to carry down the blank being counterbalanced by the action of the other, which tends to roll it upward.

The peripheries of the rolls are preferably of reduced diameter between their ends, thus leaving rims p 10, between which the blank lies when being treated. These rims not only afford a positive limit to the approach of the rolls toward each other, thus preventing the reduction of the metal beyond the predetermined degree, but they also serve to restrict the elongation of the blank, and confine it between such rims, thus tending to compact more closely the fibers of the metal as the rolling continues;

To form a headed rod grooves g It may be made in the two rolls, the depths of the grooves being in accordance with the size of the head to be formed, and the position of such groove being at the inner side of one of the rims p, or, in other words, terminating the rabbeted part or space between the opposite rims p p.-

With semicircular grooves spherical shapes projections, other round shapes may be formed.

The bearings of one or of each roll may be made adjustable to permit the rolls to be set in accordance with the diameter to which the blank'is to be reduced, and when the blank is to be considerably reduced the rolls may be made to automatically approach and recede to aid in such reduction, the relative speed of the rolls being so adjusted as to hold the blank between them until the blank is reduced to the required size, so that it will drop through the rolls.

The bearings t are shown as mounted upon slide-plates 7a, which may be moved to adjust the roll in position, and to automatically move the roll. The slides kare connected to alever, in combination with the eccentric, lever, and

l, fulcrumed at m, and connected by a link, n, sliding bearings, substantially as and for the with an eccentric, 0, on a shaft, 1), connected purpose set forth.

by gearing with the driving-shaft; and. when 2. In combination with the rolls a b, the the rolls are made adjustable intermediate mechanism, substantially as described, for imgearinginay be introduced, such gearing beparting to one of said rolls a velocity higher ing so arranged as not to interfere with the than that imparted to the other.

proper working of the rolls. HAZEN R. UN DERHILL.

I c1ain1-- Witnesses: 1. The rolls a b, having one of them a move- 1 BENJ. CHASE, J r.,

ment approaching and receding from the other, GEORGE W. BARKER. 

